Low voltage, VCC incentive, low temperature co-efficient, stable cross-coupled bandgap circuit
AssigneeTexas Instruments Incorporated
InventorDaniel E. Goldberg
Life of this patent
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Abstract
A cross-coupled bandgap circuit (10, 30) generates a stable voltage reference (Vref) at an output port (12, 32). The circuit comprises a cross-coupled current source (14, 34) coupled to a Wilson current mirror (16,36) mirroring a first current through the current source (14,34) to a current sink (18, 38), and also to a voltage generator generating the stable voltage reference. The circuit may be implemented in bi-polar, Bi-CMOS or CMOS circuitry, and is very stable across varying temperatures, varying and noisy operating voltages, between low and high operating voltages, and is stable at low operating currents.
Claims11
A circuit for providing a reference voltage to an output, comprising:
- a current generator having a drive node and comprised of cross-coupled transistors, said current generator having a first current;
- a current mirror coupled to said current generator;
- a current sink, comprising at least one diode, coupled to said current mirror and coupled to said drive node;
- and
- a reference current generator coupled to said
- current mirror and generating said reference voltage.
Dependencies are inferred from the claim text.